Why does plate movement occur

Plates at our planet's surface move due to the exceptional warmth in the Earth's center that causes liquid stone in the mantle layer to move. It moves in an example considered a convection cell that structures when warm material ascents, cools, and at last sink down. As the chilled material sinks off, it is warmed and rises once more.

Explanation:

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answer; (d) melting of sea ice;

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the answer you are looking for is relatively steep.

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